As big of a behemoth as a GL1800 is, I really couldn't find an *easily* accessible....Well...wait. That's not true.
Time for a story .
Several years ago, my wife had a seminar to attend in Palo Alto. We took the bike up there, with our small tow-behind trailer with enough gear for her to be in working clothing during the three days she was dealing with work stuff.
I got the opportunity to tag along, and while they were doing work stuff, I was doing small day trips - primarily in the South Bay area.
When we left Palo Alto, we were then on tour for the next four days, wandering thru Yosemite and Sequoia on our way back home. Now, we didn't have a *lot* of time, but it was enough to at least go "oh, yes, we need to go back and do this area again!"
The first day was not long; enough time to get out of the urban area, and I found a nice simple motel in Sonora, CA. Just around the corner from the motel within walking distance was a laundromat. We both could use a few clean clothes (we weren't nearly as tour-experienced back then as we are today) and lo-and-behold, a Pizza Hut next door - dinner!
We'd ordered a dozen wings and a small-ish pizza to share. What we got was a small-ish pizza, and
two-dozen wings!
At the end of the meal, I'd asked for aluminum foil. We wrapped up the remaining dozen chicken wings, and I put them in the saddlebag.
The next day, after several hours of riding later, we were planning a picnic lunch. From the cooler that the trailer had on it was drinks, a couple of pieces of fruit, and cheese sticks. A bag of chips was extracted from the trailer body (small goodie-bag was in side) along with our leftover chicken wings, warmed in the closed confines of a black Goldwing saddlebag.
Our picnic spot was a table in Yosemite Valley that overlooked Yosemite Falls. One of my more memorable road-side meals enjoyed while on two-wheels.
Warming something already cooked (mmmmm - tacos!) could be do-able. Actually cooking from start? Probably not on many bikes - mine included.